Lecture 1 -Properties of Matter

Lecture 1 -Properties of Matter - Lec-1: Properties of...

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Unformatted text preview: Lec-1: Properties of matter 1 Roy A. Lacey, Stony Brook University; Che 131, Splring 2011 Chemistry Chemistry is the science of matter: Chemistry is the science of matter: 9 its composition, structure, and properties 9 Measurements involve the change that matter undergoes and the energy associated with this hange change It is a valuable way to view our material world, It is a valuable way to view our material world, to interpret it, and to change it. to interpret it, and to change it. 2 Roy A. Lacey, Stony Brook University; Che 131, Splring 2011 Matter Classification MATTER (Diff. States) es o Can it be physically separated? IXTURE URE SUBSTANCE yes no MIXTURE PURE SUBSTANCE Can it be chemically ecomposed? no yes Is the composition niform? no yes Homogeneous Mixture Heterogeneous Mixture Compound Element decomposed? uniform? (solution) Colloids Suspensions 3 Roy A. Lacey, Stony Brook University; Che 131, Splring 2011 Matter Classification Roy A. Lacey, Stony Brook University; Che 131, Splring 2011 4 Familiar substances fit well in this classification Pure Substances An element is the simplest kind of material with nique physical and A compound is a substance that consists of two or more lements linked together in unique physical and chemical properties elements linked together in definite proportions aCl NaCl A given compound always contains the same, fixed ratio of 5 Roy A. Lacey, Stony Brook University; Che 131, Splring 2011 elements. Mixtures Variable combination of two or more ` In homogeneous mixtures , the nstituents are distributed eterogeneous mixtures a a b e c o b a t o o t o o o e pure substances (solid, liquid, gas) constituents are distributed uniformly throughout the sample. ` In heterogeneous mixtures , the individual components can be seen as separate substances. ` Small particles ` No Tyndall effect 6 Roy A. Lacey, Stony Brook University; Che 131, Splring 2011 Matter Classification Examples : Element ◦ Graphite ◦ sugar (sucrose) Compound Heterogeneous mixture ◦ Paint Roy A. Lacey, Stony Brook University; Che 131, Splring 2011 7 A. Element B. Compound C. Pure substance omogeneous mixture...
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This note was uploaded on 06/04/2011 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Lecture 1 -Properties of Matter - Lec-1: Properties of...

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